(CBS/AP) NEW YORK - Morgan Gliedman, the Greenwich Village woman who was arrested on a weapons charge just days before giving birth, has pleaded not guilty, CBS New York reports.

Gliedman remained free on bail following her arraignment Monday in Manhattan state Supreme Court.

Prosecutors say Gliedman's boyfriend, Aaron Greene, had a weapons cache in their Greenwich Village apartment that included bomb-making explosives.

Investigators believe the powder was hexamethylene tiperoxide diamine, or HMTD, a highly explosive ingredient used in bomb making that was discovered in Greene and Gliedman's apartment in December, police said.

She also has a drug case and theft case pending, CBS New York reported.

According to court papers, Gliedman told investigators that her boyfriend suggested buying more guns. She said he was concerned that gun possession laws would be tightened in the wake of the Newtown, Conn., school massacre.

She gave birth to a daughter, Melody, while in custody and was ordered to undergo drug treatment, CBS New York reports.

Gliedman is the daughter of a prominent real estate agent and a top-rated New York oncologist, the station says.

Gliedman, 27, and Greene, 31, were arrested in December 2012 after a police search of their home turned up papers titled "The Terrorist Encyclopedia" and "Deadly Homemade Weapons." Officials say they also found 7 grams of HMTD forcing the evacuation of three buildings in Greenwich Village.